Letting-off mechanism for looms



Oct. 2 1923.

W. SMMCHEN LETTING-OFF MECHANISM FOR Looms Filed Aug. 27. 1921 m u u u n n u 4 VIII/1n '-.fwn-ED er 1* WILHELM SIMMCHEN; or Aussieinsisting-ONTHEELEE,oznoirosiio'vaxrnf 1 and luseful ImprovementsinHLetting-Oi Mechanism for Looms',koi;Whichthefollowf .ingis a specification., 1

To all whom# may concern:

Patented oet. 2, 1923;

Be it known that I, WILHELM a citizen of the CZechosloVakia, -have invented certain new 'This inventionA relates to letting-'off niechanism 1 for looms, havingineans orl a ut on 1 at i l cally reg1ilating the delivery ofythe Warp from the Warp-beam in accordance Vwith the decreasingdiameter of they Warpon the beani-` and for-maintaining thevvarp at aunitorm' Y pose aweighted feeler lever, whichmoves as therebyshifts a stud in a slotted link or lei the'leftoffniotion is increased. 'In this .com

the diameter of the Warp u decreases, -and ver, so that the effectivel leverage producing nection means have been provided f permit- .a series of holesat yWhieha actuating memberfcan be Vcomiectedto ita-t1 vting adjustment 0f the filet-v@ motoilfbe effeeted according to the-density of vWeit required, 'one of the jlevers vhaving slotVv or'- varying distancesfrom itsffulcrum to regu# late the rate of',feecl. gtfjj i E In the structure 'embodying-mjy invention also use'theseelementg but for regulating 'of the I sityof the Weft,I' provide means foratwo-4 fold adjustmentgggnamely means 'fon-adjustf `connection'ot lthe layV or other drivf, inginember'tothe primary aotuatingvlever feed motonmechanismnd means for ing the adj ustingthe connection ot an, intermediate lever comprised in.thef;feed mot-ion mechanism to :the gear which imparts rotation tov the Warp beam.

" Ithus Combine inthe mechsearatel haveV 1n` combination Withgeach er the novel 1 and Avaluable effect of en A 'abling a coarsepreliminary V adjustment forv vveftzde nsity,ftobef follovyed by avery @Unite PreCiSe adjustment, ,the Y Whole adiest- Vment extendingfovera. very;Wide .range.V j

` addition I provide'agspring brake, j'ct-V Vratchet wheel 'forming part of; 'th-at Vgante assist in maintaining' theivvarpf at11 n'iiormy l Y Y. yield in s'case'of excessivelpull.

I- niay soarrange and combinethe eral larly .aiidfbraleon thedine g1, andv Fig. 4a section thereoon theline-XTY; 80v zorra. 1.-. l Y

tudinalslotoprovded in afleve-rfd. stud onV singlefframe .V piece f or ]or'ael;et,r which canjbe bolted orotherWiseiXedto thek frame 4of f prac't'ifcally1 any current of jf m- Y Y 'Y In' 'orden Vto* regulate the throW -of thej ratchet and thereby theJ-'Qmotionfimparted toV the nWarp beam, in accorda-ncefvvith; the di- I diameterv o thebeam,l I associata.

The actuatingrod :whereof a por ronis to astud b, Whi'chglis"adjustable-,int a longi as, e'xedto the leverjcl follisapivot oralink f, having atitsjopposite-endg astud'fgwhich Y y engagiesin aslot gl provided.v in adouble-` mounted on the looinf frame V.andlfcarrying the'entire .letting-oli' neechanisnijV Theupper arm VVof. the lever h I-hasa series'of Vholes 11 v2, 3, Vinto either Yol? whichcan be; inserted "1a stud carried at one end {ofa link t', said Alink beigwnhecte'd attsiotherend tera- Jewel 95 having avpluralityof paQvlS m atits aupper. end. These ApaWlS m engage( a' ratchetfwheel aand byvirtue of-f'their"different lengths, as -Y 'shovvn"in'j -Fig. 3, very .slightnioVemnt of.

and yimpartll-rota'tion itof the, ratchet ewheelg,

Y Y G Y hfalfffn'll, asjindicated'by'abroken line circle, I C v a vibrator-y primary actuating levervhavmg .connected by a .8 to. the sind. 'y

referredt'o," so that movement of the felerv about its pivot 5 causes the stud g to slide one Way-or the other in the slot g1V and to thus allteruthethrovv of the pavvls m. Broken minimum respectively; the feeler 4 is shown.

inith'is 'figureM 'full "linesin t an intermediate positi-oi-i,J 'with :the Warp beam e about portion.

y*As'the circumference of the Warpbeam decreases, the 'studfg mojvedupwards tof-- Wardsthe ypivot 514 off lthe'lever''/and the throvvggoffthe'paWls 'in is thus increased. Willen they 'diameter ofl theV Warp beaiifi has been reduced byfhalfgtheth'rolv of the pawls4 mand'thus fthe'ra'te of rotation of the beam isdo-u'bled,fso 'that the c'i'rclimferential'veloce ityof thebeam remains the saine andthus Weaving startedivith a full "beamf Coarse-preliminary regulation of the rate of"`f'eed,ffor roughly* determining the vveft density, is made by selecting the hole 1,101' 2, ori3`f'or Vcmplijng thelinkiz' 'to the `lever lz, this being an operation roughly 'corresponde ing to what has heretofore frequently been effected by*chinging gem-Wheels, the presl ent Aoperation beingV 1,3 -is'f'mounte'd fa U-s'haped brake member l5'Y provided wvit'li leather 'fbrake-shoes'l held,

y against-'the web ofthe ratchet Whe'elw4 by the 'action of af spring 16 bearing against the member 15. The pressure exerted this spring/'is"adjustable byineans'iof nuts 22 screwed onto the threaded endof the shaft. This( brake n'oimzvtl-ly' puts a'k drag on rthe .ratchet Wheel yngafter AVthe 'same has been rotated f by'y the'p'aivl, Y When "for each xveft Yin turn-a; 'definite predetern'iined 'let-off has Y talrenpla'ce,bu'tunder certain circumstances' the brake wwould yield to allowft'lie cloth general fprinciple' set "forth Y' 'already y `Vmuchlsimpler and spee'd'ier.- :Fi'ne adjustment of" the weft' density is then Vmade by setting the stud o 'Y range' prising -in Vcombination a i Ai' Y What I' claim as my invention, anddeslre tosecure by Letters Patent of the'r United States of VAmerica is: Y

l. Letting-off mechanism for laoomspcom prising in combination a. Warpr'beam, a ratchet,feedfvvheel ancL an actuating lever Ytherefor carrying the pavvl for said Wheel, .a

train of gears, whereby said Afeed gear rotates the warp beam, a spring controlled brake acting on said feedgear and comprising a spring actuated U-shaped niemberfricf tionally bearing against said'ra'tcliet'wlieel,

a slot -for finely acljustably. Vconnecting itr With a suitable driving memberrof the loom, a second Ainteri'nediary slotted vibratory `le:

ver, coarsely adjustable means for' connecting said second lever to the feed gear actuating lever, a' feeler lever incontactavith ther Warp on the Warp beam andA movableV in accordance with the amount of Warpon the beam.` and means controlled by 'said feeler" lever adjustably connecting Ithe primary j actuating lever With said/,second leverfor the purpose of controlling' the delivery speed'of the Warp beam inaccordance with' the decreasing diameter of the Warp there? ont, to maintain the-warp `at a uniform ten'- sion `and vvto permit alcoarse and,V afiine preliminary adjustment ofv said ratchet gearV for adjusting thevveft density;

` 2. YLetting-"ofi" mechanism for Ylooms com prising inlcombination a- YWarp'beam, ratchet feed Wheel and an actuating Vlever therefor carrying the paivl'for said Wheel, a

train :of gears, whereby said feed gear rotates the Warp beam, a spring 'controlled brake act-ing on saidrfeed gear and compris` ing a spring actuated Ueshaped member frictionally bearing 'against said ratchet'Wheel,l i

a vibratory primary actuating lever having a slot' for inely adjustably connecting'fit With a suitabledriving member of the loom',

a secondl intermediary slotted Vvibratory- Y lever, coarsely adjustable means for connect! ing said secondk leverto they feed gear actuatinglever, a fe'eler lever inV contact'wvithV the Warp on theiwarp beam and Vmovable in accordance with the amount ofvvarp'fon theV beam andm'eans controlled by saidf'eeler lever adj ustably connectingn .the actuating leverfwith said' second lever for the purpose ofcontrolling the 'delivery speed of the: Warp beam inaccordance with ytliejA Y decreasing-diameter of the Warpfther'eon, 'to Vmaintaint-he'warp at a uniformtension 'and to 4permit a coarse andv a: line preliminary adjustment of saidratc'het; 'earforv adjustbeing' piv'otallyf mounted o'njthepivotal' aile" 'Y kof'saidlatflhetllever.

3. Letting-oilinechanism1 primary train of gears, whereby said feed gear rotates the warp beam, a spring controlled brakefacting on said feed'gear and coniprising. a spring actuated U-shaped member frictionally bearing against said ratchety wheel, a vibratory Ajorimary actuating lever having a slot for finely adjustably ,connect-l ing it with a suitable driving member of the loom, a second intermediary slotted vibratory lever,l coarsely adjustable' means for connecting said second lever to the feed gearV actuating lever, av t feeler lever in contact with the warp on the warp ,beam` and movable in accordance with the amount of warp "on, the beam and means controlled'by said :eeler lever adjnstably connecting the pric f mary actuating lever with said second lever on, to maintain the, warp at a'uniform ten.-

sionand to permit a coarse and a'ine 1ere-,k i c liminary adjusting of said ratchetgear-for adjusting the weft density, all ofsaidlevers loom. f

for the purposegof controlling ythefdeli-very f 7 speed ofthe warp beam in' accordance kwith` the Vdecreasing diameterof the warp there-"20jv i Y' Intestimony whereof I 'affix my signature i in presence of two witnesses.

WILHELMSIMMCEN 2 Y 

